Skip to content
Brand Logo

DT125R FORUM
  1. Home
  2. Technical Zone

Technical Zone

Need Information on a Specific Part? Post Here!
1.3k Topics 11.4k Posts

Subcategories

  • Suspension Related
    100 766
    100 Topics
    766 Posts
    YzDt85Y
    I found out that the shorter rear axle collar(part numper 90387-202U8) is the same on the Wr200 and Dt. If anyone has that longer collar(part numper 90387-206X8), could you measure its length? And if anyone has a wr200 rear axle, could you measure its length? The rear axle part numbers of the Wr and Dt are almost the same WR axle part numper 3XP-25381-00 DT axle part numper 3BN-25381-00

  • Exhaust Related
    64 569
    64 Topics
    569 Posts
    D
    as far as i m aware there are 3 different types of tzr the first model series 2 (RR) an tzr125r sp i have an exhaust with the code 4DL E46 10 20 what model is it intended for

  • Framework Related
    86 606
    86 Topics
    606 Posts
    CalumC
    That's normal. All DTs are like that. [image: IMG-20251011-114625.jpg]

  • Wheel Related
    81 733
    81 Topics
    733 Posts
    CalumC
    @ChuckSR86 Do you have a DTR or a DTX? [image: yamaha%20dtx%202006.jpg] or [image: yamaha%20DT%20125%20R%201991.jpg] I must admit, if it's light greenlaning, then you can get away with it on supermoto in the summer? Anything more hardcore then some knobbley's would be ideal. For simplicity, I'd be lacing a set of hubs with ally rims for knobbleys. That way you only need to swap the wheels and not the brakes.

  • Electric Related
    257 2k
    257 Topics
    2k Posts
    R
    I recommend Zeeltronic too.

  • Brake Related
    67 444
    67 Topics
    444 Posts
    G
    @HOTSHOT III Thanks for the reply bud yea all good on that front it’s the long pedal travel I don’t like it’s just me and how I like things

  • Engine Related
    540 5k
    540 Topics
    5k Posts
    CalumC
    Yes your DT will be autolube. If it wasn't... you'd have known by now. You'll need to keep an on eye on the two stroke level and refill it as it gets depleted.
  • declanD

    Snorkel out flat power curve?

    4
    0 Votes
    4 Posts
    1k Views
    J
    Removing the snorkel affects the jetting, so jet accordingly. It can also decrese the low end a bit, as theres not much velocity through the carb when you whack the throttle open at low speed. IMO the airbox seems pretty restrictive, so removing the snorkel adds tons of air. You can be both rich and lean, as in lean in the midrange, and rich on the mainjet, or the other way around.
  • Bilbo25ukB

    Chain roller problem

    10
    0 Votes
    10 Posts
    2k Views
    Yamboy46Y
    Cheers calum got that sorted now bud. Thankyou
  • declanD

    Pv adjustment help

    42
    0 Votes
    42 Posts
    8k Views
    J
    Is the servo disconnected? They can act up aswell due to corrosion and such.
  • declanD

    Carb clean abs rebuild help

    33
    0 Votes
    33 Posts
    5k Views
    F
    Ahh fair enough then. Every bike is different lol
  • D

    What is causing my bike to overheat?

    13
    0 Votes
    13 Posts
    3k Views
    D
    You guys have given me a lot to work with... No, I definitely won't be riding it anywhere when it's running like this. I'll print off this whole thread and show it to my friend who knows a lot more about bikes than me... Thanks
  • declanD

    Bleeding hydraulic clutch?

    13
    0 Votes
    13 Posts
    2k Views
    Glynn123G
    Will have a shot of it over this winter, got big plans for the old DT in the next few months so will report back
  • declanD

    Coolant overflow leaking

    25
    0 Votes
    25 Posts
    6k Views
    CalumC
    @irongamer727 You probably won't gain higher revs, as unfortunately, the ability to rev higher is lost with the bigger bore. But yes, you will be able to dial in the ignition much more towards the bigger cylinder. I'd have thought there would be some nice gains with this and the bigger bore.
  • declanD

    Redlining issue?

    42
    0 Votes
    42 Posts
    7k Views
    declanD
    @ninja that’s better!
  • declanD

    Bike running fast revs

    52
    0 Votes
    52 Posts
    9k Views
    declanD
    @scrimsmustang it seems to be sorted now put a stiffer spring in
  • O

    Inlet rubber3bn/3et

    31
    0 Votes
    31 Posts
    6k Views
    declanD
    @ricky0115 don’t use rtv silicone it ends up in your reed cage
  • declanD

    Engine swaps for dummies!

    13
    0 Votes
    13 Posts
    3k Views
    ZrakoZ
    @perithtv I've been there too few months ago. Soaking , heating etc etc nothing Take off everything possible what can restrict you in the back and chop the bolt on as much places as angle grinder let you. I had 4 cuts and lifted the pieces off. Bought brand new guts for it and there is more grease then metal on it 😂 damaged my axe on it too 😁
  • D

    DTR 2003 Replacement Carb?

    10
    0 Votes
    10 Posts
    3k Views
    J
    When I bought my bike carb was leaking from overflow pipe all the time, when tank valve was open. I opened the carb and the reason was that, the float valve was upside down! I turn it to right way and overflow stop immediately!!! Check that!
  • declanD

    Oiled filters

    6
    0 Votes
    6 Posts
    1k Views
    J
    Cant see why you wouldt want to get better filtration... Airfilter oil is pretty cheap, and the filter is made to flow this way. Youd' be surprised how much crap it catches when you clean it.
  • declanD

    Fuel additive safe for 2 strokes

    9
    0 Votes
    9 Posts
    2k Views
    declanD
    @Calum ??
  • A

    Power Valve set up

    4
    0 Votes
    4 Posts
    2k Views
    declanD
    @Zrako when I rebuilt my bike my servo would get stuck when turning on the ignition how ever I kept turning the key and it sorted its self out no problem
  • D

    Strange yvps

    3
    0 Votes
    3 Posts
    1k Views
    D
    It says 3nc-00 on cdi
  • declanD

    Lingering revs and no running without choke

    13
    0 Votes
    13 Posts
    3k Views
    declanD
    @Calum thanks! What revs do the the dts go to on full choke
  • K

    YVPS.

    19
    0 Votes
    19 Posts
    4k Views
    CalumC
    @Mightyman Nah the DTRE's were given full YPVS servos. Although you make a good point, the YPVS does shut off at 10'000 rpm as a restriction. But the point here is the build up of NoX's gases. So whilst they did shut off, the normal person would be part throttle anyway. And if you were pinning it, well you would expect it to give up eventually and this might be why.
  • declanD

    Missing oil pump nipple need help!

    20
    0 Votes
    20 Posts
    4k Views
    declanD
    @jgr72 if I remember I'll look at my other bike it might have the size of pipe printed on it
  • declanD

    How do you break in your fresh re bores

    14
    0 Votes
    14 Posts
    3k Views
    declanD
    @Calum figured so thanks